Manahive

Equivalent cards to “Fathom Fleet Firebrand” (red, 2 mana, common, repeatable power boost) include:

• “Emberwilde Augur” (1R, can sacrifice for damage, but less similar)
• “Fire Shrine Keeper” (R, can pay lots of mana to deal damage)
• “Bloodrage Brawler” (1R, higher base power but downside)
• “Raging Swordtooth” is not equivalent (different CMC/effect).

Closest in ability:
“Bloodrock Cyclops” (2R, attacks each turn, but no pump ability)
No exact match for repeatable “firebreathing” at this rarity, but “Torch Fiend” (1R, can sac to destroy artifact) is similar stats and role.

Reason: Few modern 2-drop red commons have the exact firebreathing activated ability of “Fathom Fleet Firebrand.”